a) $$\frac{4}{5} = \frac{4 \times 2}{5 \times 2} = \frac{8}{10} = 0.8$$
b) $$\frac{12}{25} = \frac{12 \times 4}{25 \times 4} = \frac{48}{100} = 0.48$$
в) $$\frac{113}{250} = \frac{113 \times 4}{250 \times 4} = \frac{452}{1000} = 0.452$$
Ответ: а) 0.8 б) 0.48 в) 0.452